Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 20: Inorganic/Organic Interfaces: Growth III
O 20.10: Talk
Tuesday, March 17, 2015, 12:45–13:00, MA 005
Pyrene derivatives on Au(111): the role of halogen substituents in self-assembled network formation — •Van Bay Tran1, Tuan Anh Pham1, Fei Song1, Manh Thuong Nguyen2, and Meike Stöhr1 — 1Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, the Netherlands — 2The Abdus Salam International Center for Theoretical Physics, Strada Costiera 11, I-34151 Trieste, Italy
Halogen bonding is nowadays considered as an important tool for steering intermolecular interactions in supramolecular chemistry as well as crystal engineering. The formation of two dimensional (2D) molecular networks based on halogen bonding interactions has recently been reported at the solid-vacuum interface as well as at the solid-liquid interface. This is expected to open up new opportunities for the construction of organic thin film-based devices for future applications. However, the exact role of the halogen substituents in the structural formation of such networks attracts less attention and therefore, asks for more studies. In this work, we present the self-assembly of two bromine-functionalized pyrene derivatives on a Au(111) substrate by using scanning tunneling microscopy and low energy electron diffraction under ultrahigh vacuum conditions combined with density functional theory calculations. The study focuses on the influence of the halogen substituents on the resulting 2D molecular networks. Based on the theoretical calculations, the obtained self-assembled patterns are explained via optimizing the intermolecular interactions.